Kstars

src/geom.h
1 /*
2 ** Author: Eric Veach, July 1994.
3 **
4 */
5 
6 #ifndef __geom_h_
7 #define __geom_h_
8 
9 #include "mesh.h"
10 
11 #ifdef NO_BRANCH_CONDITIONS
12 /* MIPS architecture has special instructions to evaluate boolean
13  * conditions -- more efficient than branching, IF you can get the
14  * compiler to generate the right instructions (SGI compiler doesn't)
15  */
16 #define VertEq(u, v) (((u)->s == (v)->s) & ((u)->t == (v)->t))
17 #define VertLeq(u, v) (((u)->s < (v)->s) | ((u)->s == (v)->s & (u)->t <= (v)->t))
18 #else
19 #define VertEq(u, v) ((u)->s == (v)->s && (u)->t == (v)->t)
20 #define VertLeq(u, v) (((u)->s < (v)->s) || ((u)->s == (v)->s && (u)->t <= (v)->t))
21 #endif
22 
23 #define EdgeEval(u, v, w) __gl_edgeEval(u, v, w)
24 #define EdgeSign(u, v, w) __gl_edgeSign(u, v, w)
25 
26 /* Versions of VertLeq, EdgeSign, EdgeEval with s and t transposed. */
27 
28 #define TransLeq(u, v) (((u)->t < (v)->t) || ((u)->t == (v)->t && (u)->s <= (v)->s))
29 #define TransEval(u, v, w) __gl_transEval(u, v, w)
30 #define TransSign(u, v, w) __gl_transSign(u, v, w)
31 
32 #define EdgeGoesLeft(e) VertLeq((e)->Dst, (e)->Org)
33 #define EdgeGoesRight(e) VertLeq((e)->Org, (e)->Dst)
34 
35 #undef ABS
36 #define ABS(x) ((x) < 0 ? -(x) : (x))
37 #define VertL1dist(u, v) (ABS(u->s - v->s) + ABS(u->t - v->t))
38 
39 #define VertCCW(u, v, w) __gl_vertCCW(u, v, w)
40 
41 int __gl_vertLeq(GLUvertex *u, GLUvertex *v);
42 GLdouble __gl_edgeEval(GLUvertex *u, GLUvertex *v, GLUvertex *w);
43 GLdouble __gl_edgeSign(GLUvertex *u, GLUvertex *v, GLUvertex *w);
44 GLdouble __gl_transEval(GLUvertex *u, GLUvertex *v, GLUvertex *w);
45 GLdouble __gl_transSign(GLUvertex *u, GLUvertex *v, GLUvertex *w);
46 int __gl_vertCCW(GLUvertex *u, GLUvertex *v, GLUvertex *w);
47 void __gl_edgeIntersect(GLUvertex *o1, GLUvertex *d1, GLUvertex *o2, GLUvertex *d2, GLUvertex *v);
48 
49 #endif
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